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Revision 29a951dfb3c3263c3a0f3bd9f7f2c2cfde4baedb authored by Linus Torvalds on 08 January 2021, 21:13:41 UTC, committed by Linus Torvalds on 16 January 2021, 18:46:39 UTC 
mm: fix clear_refs_write locking
 
Turning page table entries read-only requires the mmap_sem held for
writing.

So stop doing the odd games with turning things from read locks to write
locks and back.  Just get the write lock.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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